Other available revisons

Corrected the new normalised Gamma model for topics so it works with multicore. Improvements to documentation. Added an asymptotic version of the generalised Stirling numbers so it longer fails when they run out of bounds on bigger data.

Modified command line -A and -B formats. Overhaul of diagnostics.
Described changes in manual.
Bug fixes: multi-core crashing when huge number of topics;
-B when using number and fitting beta, beta sampling wasn't
working; both now fixed.